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Jgs1 Jgs2 Jgs3 Quartz Glass Optical Disc. Professional Factory Supply: Direct supply from professional manufacturer ensuring better quality and lower price. Fast Standard Delivery: Standard size delivery time is 7-14 days for quick fulfillment. Free Sample Availability: Free samples provided, customer only pays for freight costs. Global Sales Agents: Sales agents in USA, Europe, and Southeast Asia for faster local purchasing. Multi-Industry Application: Suitable for Chemical, Glass, High Precision Optical Elements, and Laser Industry. Certified Quality: Products certified with CE and ISO standards for reliability. High Hardness and Strength: Mohs Hardness 5.5 and Compressive Strength 1130n/mm2 for durability.